网格状带齿加筋体界面特性的宏细观力学机制研究

›› 2013, Vol. 34 ›› Issue (10): 2863-2868.

网格状带齿加筋体界面特性的宏细观力学机制研究

林永亮¹，张波¹，张孟喜¹，赵岗飞²

1.上海大学土木工程系，上海 200072；2.山西潞安工程有限公司，山西长治 046000

收稿日期:2013-03-25 出版日期:2013-10-09 发布日期:2013-10-18
作者简介:林永亮，男，1977年生，博士后，讲师，主要从事土工加筋技术、土动力与工程抗震等方面的研究工作
基金资助:
国家自然科学青年基金项目资助（No. 51209132）

Micro and meso-mechanism study of interface behavior of earth reinforced with denti-inclusions

LIN Yong-liang¹, ZHANG Bo¹, ZHANG Meng-xi¹, ZHAO Gang-fei²

1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 2. Lu’an Engineering Co., Ltd., Changzhi, Shanxi 046000, China

Received:2013-03-25 Online:2013-10-09 Published:2013-10-18

摘要/Abstract

摘要： 网格状带齿加筋是一种新型的土工加筋技术，汲取了传统网格状与条带式带齿加筋的优点，其筋土界面特性是加筋结构设计的基础。利用室内拉拔试验从宏观角度分析筋材与土的界面特性，结合颗粒流程序，筋材用平行黏结模拟，从细观角度分析筋土接触界面的产生和发展演化规律。数值结果表明：齿筋的存在对界面处颗粒的移动及剪切带的宽度影响显著，其破坏模式呈现波浪型，在齿筋附近出现应力集中现象。筋土界面处筋材与土颗粒摩擦、咬合和阻抗作用提供“似黏聚力”是改变网格状带齿加筋体系作用机制的内在原因。研究成果对于明确网格状带齿加筋拉拔的机制及模型的建立都具有意义。

关键词: 网格状带齿, 界面特性, 细观机制, 拉拔试验

Abstract: Sandy soil reinforced with denti-inclusions is a new concept of reinforced soil. In the grid with denti-inclusions, besides the conventional latticed inclusions, vertical reinforced elements are also placed in the soil. The behavior of interface between soil and geosynthetics is a significant factor for analysis and design of reinforced earth structures which is simplified as pullout performance. This paper presents the results of pullout tests and numerical simulation aimed at studying the interaction mechanism of reinforced sand. The pullout test is carried out to study the macroscopic mechanism. PFC is adopted to simulate pullout tests and the interface between geosynthetics and sand with emphasis on the meso-analysis. On such a basis, the model of PFC is established by using parallel-bond model to simulate the reinforcement. The sand particle movement trajectory and the particle contact orientations are studied. The results show that the shear bond is influenced by the denti-inclusions and the stress concentration occurs nearby the denti-inclusions. The intrinsic factors which form and change the mechanism of the interface properties are the “cohesion” provided by friction, occlusive force and passive resistances. The study results can provide a new understanding for future studies on the mechanism of the reinforced interface.

Key words: grid with denti-inclusions, interface behavior, mesomechanics, pullout test

中图分类号:

TU 472.3+4

林永亮，张波，张孟喜，赵岗飞 . 网格状带齿加筋体界面特性的宏细观力学机制研究[J]. , 2013, 34(10): 2863-2868.

LIN Yong-liang , ZHANG Bo , ZHANG Meng-xi , ZHAO Gang-fei . Micro and meso-mechanism study of interface behavior of earth reinforced with denti-inclusions[J]. , 2013, 34(10): 2863-2868.

参考文献

相关文章 15

[1]	金青, 王艺霖, 崔新壮, 王成军 , 张珂, 刘正银, . 拉拔作用下土工合成材料在风化料-废弃轮胎橡胶颗粒轻质土中的变形行为研究[J]. 岩土力学, 2020, 41(2): 408-418.
[2]	何鹏飞, 马巍, 穆彦虎, 黄永庭, 董建华, . 黄土−砂浆块界面剪切特性试验及本构模型研究[J]. 岩土力学, 2019, 40(S1): 82-90.
[3]	张传庆, 刘振江, 张春生, 周辉, 高阳, 侯靖, . 隐晶质玄武岩破裂演化及破坏特征试验研究[J]. 岩土力学, 2019, 40(7): 2487-2496.
[4]	李晓照, 戚承志, 邵珠山, 屈小磊, . 基于细观力学脆性岩石剪切特性演化模型研究[J]. 岩土力学, 2019, 40(4): 1358-1367.
[5]	高俊丽, 徐宏飞, 曹威, 袁川. 加肋土工膜与砂土拉拔试验及界面细观分析[J]. 岩土力学, 2019, 40(12): 4668-4674.
[6]	冯君, 王洋, 张俞峰, 黄林, 何长江, 吴红刚, . 玄武岩纤维与钢筋锚杆锚固性能现场对比试验研究[J]. 岩土力学, 2019, 40(11): 4185-4193.
[7]	赵象卓，张宏伟，CAO Chen，张明，张怀东，韩军, . 不同围岩条件下锚杆肋间距与锚固力优化研究[J]. , 2018, 39(4): 1263-1270.
[8]	刘嘉英，马刚，周伟，常晓林, . 抗转动特性对颗粒材料分散性失稳的影响研究[J]. , 2017, 38(5): 1472-1480.
[9]	郑俊杰，曹文昭，周燕君，江金国. 三向土工格栅筋-土界面特性拉拔试验研究[J]. , 2017, 38(2): 317-324.
[10]	毕冬宾，尤志嘉，刘群，王程程，时健. 土层锚固体复合界面单元形式及力学效应研究[J]. , 2017, 38(1): 277-283.
[11]	张向东，王帅，赵阳豪，孙小彬，. 基于端锚黏结式锚杆静、动载试验的非均匀受力锚杆单元[J]. , 2016, 37(1): 269-278.
[12]	蔡剑韬. 土工格栅加筋膨胀土拉拔试验研究[J]. , 2015, 36(S1): 204-208.
[13]	刘军，李波. 围堰防渗墙与复合土工膜联接型式试验研究[J]. , 2015, 36(S1): 531-536.
[14]	陈剑文，杨春和,. 基于细观变形理论的盐岩塑性本构模型研究[J]. , 2015, 36(1): 117-122.
[15]	苗晨曦，郑俊杰，崔明娟，谢明星，赵建斌，. 三向土工格栅筋土界面及摩擦特性的离散元模拟[J]. , 2014, 35(S1): 423-430.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed